/*
* lm3533-core.c -- LM3533 Core
*
* Copyright (C) 2011-2012 Texas Instruments
*
* Author: Johan Hovold <jhovold@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/mfd/lm3533.h>
#define LM3533_BOOST_OVP_MASK 0x06
#define LM3533_BOOST_OVP_SHIFT 1
#define LM3533_BOOST_FREQ_MASK 0x01
#define LM3533_BOOST_FREQ_SHIFT 0
#define LM3533_BL_ID_MASK 1
#define LM3533_LED_ID_MASK 3
#define LM3533_BL_ID_MAX 1
#define LM3533_LED_ID_MAX 3
#define LM3533_HVLED_ID_MAX 2
#define LM3533_LVLED_ID_MAX 5
#define LM3533_REG_OUTPUT_CONF1 0x10
#define LM3533_REG_OUTPUT_CONF2 0x11
#define LM3533_REG_BOOST_PWM 0x2c
#define LM3533_REG_MAX 0xb2
static struct mfd_cell lm3533_als_devs[] = {
{
.name = "lm3533-als",
.id = -1,
},
};
static struct mfd_cell lm3533_bl_devs[] = {
{
.name = "lm3533-backlight",
.id = 0,
},
{
.name = "lm3533-backlight",
.id = 1,
},
};
static struct mfd_cell lm3533_led_devs[] = {
{
.name = "lm3533-leds",
.id = 0,
},
{
.name = "lm3533-leds",
.id = 1,
},
{
.name = "lm3533-leds",
.id = 2,
},
{
.name = "lm3533-leds",
.id = 3,
},
};
int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val)
{
int tmp;
int ret;
ret = regmap_read(lm3533->regmap, reg, &tmp);
if (ret < 0) {
dev_err(lm3533->dev, "failed to read register %02x: %d\n",
reg, ret);
return ret;
}
*val = tmp;
dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val);
return ret;
}
EXPORT_SYMBOL_GPL(lm3533_read);
int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val)
{
int ret;
dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val);
ret = regmap_write(lm3533->regmap, reg, val);
if (ret < 0) {
dev_err(lm3533->dev, "failed to write register %02x: %d\n",
reg, ret);
}
return ret;
}
EXPORT_SYMBOL_GPL(lm3533_write);
int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask)
{
int ret;
dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask);
ret = regmap_update_bits(lm3533->regmap, reg, mask, val);
if (ret < 0) {
dev_err(lm3533->dev, "failed to update register %02x: %d\n",
reg, ret);
}
return ret;
}
EXPORT_SYMBOL_GPL(lm3533_update);
static int lm3533_set_boost_freq(struct lm3533 *lm3533,
enum lm3533_boost_freq freq)
{
int ret;
ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
freq << LM3533_BOOST_FREQ_SHIFT,
LM3533_BOOST_FREQ_MASK);
if (ret)
dev_err(lm3533->dev, "failed to set boost frequency\n");
return ret;
}
static int lm3533_set_boost_ovp(struct lm3533 *lm3533,
enum lm3533_boost_ovp ovp)
{
int ret;
ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
ovp << LM3533_BOOST_OVP_SHIFT,
LM3533_BOOST_OVP_MASK);
if (ret)
dev_err(lm3533->dev, "failed to set boost ovp\n");
return ret;
}
/*
* HVLED output config -- output hvled controlled by backlight bl
*/
static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl)
{
u8 val;
u8 mask;
int shift;
int ret;
if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX)
return -EINVAL;
if (bl > LM3533_BL_ID_MAX)
return -EINVAL;
shift = hvled - 1;
mask = LM3533_BL_ID_MASK << shift;
val = bl << shift;
ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask);
if (ret)
dev_err(lm3533->dev, "failed to set hvled config\n");
return ret;
}
/*
* LVLED output config -- output lvled controlled by LED led
*/
static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led)
{
u8 reg;
u8 val;
u8 mask;
int shift;
int ret;
if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX)
return -EINVAL;
if (led > LM3533_LED_ID_MAX)
return -EINVAL;
if (lvled < 4) {
reg = LM3533_REG_OUTPUT_CONF1;
shift = 2 * lvled;
} else {
reg = LM3533_REG_OUTPUT_CONF2;
shift = 2 * (lvled - 4);
}
mask = LM3533_LED_ID_MASK << shift;
val = led << shift;
ret = lm3533_update(lm3533, reg, val, mask);
if (ret)
dev_err(lm3533->dev, "failed to set lvled config\n");
return ret;
}
static void lm3533_enable(struct lm3533 *lm3533)
{
if (gpio_is_valid(lm3533->gpio_hwen))
gpio_set_value(lm3533->gpio_hwen, 1);
}
static void lm3533_disable(struct lm3533 *lm3533)
{
if (gpio_is_valid(lm3533->gpio_hwen))
gpio_set_value(lm3533->gpio_hwen, 0);
}
enum lm3533_attribute_type {
LM3533_ATTR_TYPE_BACKLIGHT,
LM3533_ATTR_TYPE_LED,
};
struct lm3533_device_attribute {
struct device_attribute dev_attr;
enum lm3533_attribute_type type;
union {
struct {
u8 id;
} output;
} u;
};
#define to_lm3533_dev_attr(_attr) \
container_of(_attr, struct lm3533_device_attribute, dev_attr)
static ssize_t show_output(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct lm3533 *lm3533 = dev_get_drvdata(dev);
struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
int id = lattr->u.output.id;
u8 reg;
u8 val;
u8 mask;
int shift;
int ret;
if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) {
reg = LM3533_REG_OUTPUT_CONF1;
shift = id - 1;
mask = LM3533_BL_ID_MASK << shift;
} else {
if (id < 4) {
reg = LM3533_REG_OUTPUT_CONF1;
shift = 2 * id;
} else {
reg = LM3533_REG_OUTPUT_CONF2;
shift = 2 * (id - 4);
}
mask = LM3533_LED_ID_MASK << shift;
}
ret = lm3533_read(lm3533, reg, &val);
if (ret)
return ret;
val = (val & mask) >> shift;
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}
static ssize_t store_output(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct lm3533 *lm3533 = dev_get_drvdata(dev);
struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
int id = lattr->u.output.id;
u8 val;
int ret;
if (kstrtou8(buf, 0, &val))
return -EINVAL;
if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT)
ret = lm3533_set_hvled_config(lm3533, id, val);
else
ret = lm3533_set_lvled_config(lm3533, id, val);
if (ret)
return ret;
return len;
}
#define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \
struct lm3533_device_attribute lm3533_dev_attr_##_name = \
{ .dev_attr = __ATTR(_name, _mode, _show, _store), \
.type = _type, \
.u.output = { .id = _id }, }
#define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \
LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \
show_output, store_output, _type, _id)
#define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \
LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr)
#define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \
LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr)
/*
* Output config:
*
* output_hvled<nr> 0-1
* output_lvled<nr> 0-3
*/
static LM3533_OUTPUT_HVLED_ATTR_RW(1);
static LM3533_OUTPUT_HVLED_ATTR_RW(2);
static LM3533_OUTPUT_LVLED_ATTR_RW(1);
static LM3533_OUTPUT_LVLED_ATTR_RW(2);
static LM3533_OUTPUT_LVLED_ATTR_RW(3);
static LM3533_OUTPUT_LVLED_ATTR_RW(4);
static LM3533_OUTPUT_LVLED_ATTR_RW(5);
static struct attribute *lm3533_attributes[] = {
&lm3533_dev_attr_output_hvled1.dev_attr.attr,
&lm3533_dev_attr_output_hvled2.dev_attr.attr,
&lm3533_dev_attr_output_lvled1.dev_attr.attr,
&lm3533_dev_attr_output_lvled2.dev_attr.attr,
&lm3533_dev_attr_output_lvled3.dev_attr.attr,
&lm3533_dev_attr_output_lvled4.dev_attr.attr,
&lm3533_dev_attr_output_lvled5.dev_attr.attr,
NULL,
};
#define to_dev_attr(_attr) \
container_of(_attr, struct device_attribute, attr)
static umode_t lm3533_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct lm3533 *lm3533 = dev_get_drvdata(dev);
struct device_attribute *dattr = to_dev_attr(attr);
struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr);
enum lm3533_attribute_type type = lattr->type;
umode_t mode = attr->mode;
if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT)
mode = 0;
else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED)
mode = 0;
return mode;
};
static struct attribute_group lm3533_attribute_group = {
.is_visible = lm3533_attr_is_visible,
.attrs = lm3533_attributes
};
static int lm3533_device_als_init(struct lm3533 *lm3533)
{
struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
int ret;
if (!pdata->als)
return 0;
lm3533_als_devs[0].platform_data = pdata->als;
lm3533_als_devs[0].pdata_size = sizeof(*pdata->als);
ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL,
0, NULL);
if (ret) {
dev_err(lm3533->dev, "failed to add ALS device\n");
return ret;
}
lm3533->have_als = 1;
return 0;
}
static int lm3533_device_bl_init(struct lm3533 *lm3533)
{
struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
int i;
int ret;
if (!pdata->backlights || pdata->num_backlights == 0)
return 0;
if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs))
pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs);
for (i = 0; i < pdata->num_backlights; ++i) {
lm3533_bl_devs[i].platform_data = &pdata->backlights[i];
lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]);
}
ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs,
pdata->num_backlights, NULL, 0, NULL);
if (ret) {
dev_err(lm3533->dev, "failed to add backlight devices\n");
return ret;
}
lm3533->have_backlights = 1;
return 0;
}
static int lm3533_device_led_init(struct lm3533 *lm3533)
{
struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
int i;
int ret;
if (!pdata->leds || pdata->num_leds == 0)
return 0;
if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs))
pdata->num_leds = ARRAY_SIZE(lm3533_led_devs);
for (i = 0; i < pdata->num_leds; ++i) {
lm3533_led_devs[i].platform_data = &pdata->leds[i];
lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]);
}
ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs,
pdata->num_leds, NULL, 0, NULL);
if (ret) {
dev_err(lm3533->dev, "failed to add LED devices\n");
return ret;
}
lm3533->have_leds = 1;
return 0;
}
static int lm3533_device_setup(struct lm3533 *lm3533,
struct lm3533_platform_data *pdata)
{
int ret;
ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq);
if (ret)
return ret;
ret = lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
if (ret)
return ret;
return 0;
}
static int lm3533_device_init(struct lm3533 *lm3533)
{
struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
int ret;
dev_dbg(lm3533->dev, "%s\n", __func__);
if (!pdata) {
dev_err(lm3533->dev, "no platform data\n");
return -EINVAL;
}
lm3533->gpio_hwen = pdata->gpio_hwen;
dev_set_drvdata(lm3533->dev, lm3533);
if (gpio_is_valid(lm3533->gpio_hwen)) {
ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen,
GPIOF_OUT_INIT_LOW, "lm3533-hwen");
if (ret < 0) {
dev_err(lm3533->dev,
"failed to request HWEN GPIO %d\n",
lm3533->gpio_hwen);
return ret;
}
}
lm3533_enable(lm3533);
ret = lm3533_device_setup(lm3533, pdata);
if (ret)
goto err_disable;
lm3533_device_als_init(lm3533);
lm3533_device_bl_init(lm3533);
lm3533_device_led_init(lm3533);
ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
if (ret < 0) {
dev_err(lm3533->dev, "failed to create sysfs attributes\n");
goto err_unregister;
}
return 0;
err_unregister:
mfd_remove_devices(lm3533->dev);
err_disable:
lm3533_disable(lm3533);
return ret;
}
static void lm3533_device_exit(struct lm3533 *lm3533)
{
dev_dbg(lm3533->dev, "%s\n", __func__);
sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);
mfd_remove_devices(lm3533->dev);
lm3533_disable(lm3533);
}
static bool lm3533_readable_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x10 ... 0x2c:
case 0x30 ... 0x38:
case 0x40 ... 0x45:
case 0x50 ... 0x57:
case 0x60 ... 0x6e:
case 0x70 ... 0x75:
case 0x80 ... 0x85:
case 0x90 ... 0x95:
case 0xa0 ... 0xa5:
case 0xb0 ... 0xb2:
return true;
default:
return false;
}
}
static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x34 ... 0x36: /* zone */
case 0x37 ... 0x38: /* adc */
case 0xb0 ... 0xb1: /* fault */
return true;
default:
return false;
}
}
static bool lm3533_precious_register(struct device *dev, unsigned int reg)
{
switch (reg) {
case 0x34: /* zone */
return true;
default:
return false;
}
}
static struct regmap_config regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = LM3533_REG_MAX,
.readable_reg = lm3533_readable_register,
.volatile_reg = lm3533_volatile_register,
.precious_reg = lm3533_precious_register,
};
static int lm3533_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct lm3533 *lm3533;
int ret;
dev_dbg(&i2c->dev, "%s\n", __func__);
lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
if (!lm3533)
return -ENOMEM;
i2c_set_clientdata(i2c, lm3533);
lm3533->regmap = devm_regmap_init_i2c(i2c, ®map_config);
if (IS_ERR(lm3533->regmap))
return PTR_ERR(lm3533->regmap);
lm3533->dev = &i2c->dev;
lm3533->irq = i2c->irq;
ret = lm3533_device_init(lm3533);
if (ret)
return ret;
return 0;
}
static int lm3533_i2c_remove(struct i2c_client *i2c)
{
struct lm3533 *lm3533 = i2c_get_clientdata(i2c);
dev_dbg(&i2c->dev, "%s\n", __func__);
lm3533_device_exit(lm3533);
return 0;
}
static const struct i2c_device_id lm3533_i2c_ids[] = {
{ "lm3533", 0 },
{ },
};
MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);
static struct i2c_driver lm3533_i2c_driver = {
.driver = {
.name = "lm3533",
.owner = THIS_MODULE,
},
.id_table = lm3533_i2c_ids,
.probe = lm3533_i2c_probe,
.remove = lm3533_i2c_remove,
};
static int __init lm3533_i2c_init(void)
{
return i2c_add_driver(&lm3533_i2c_driver);
}
subsys_initcall(lm3533_i2c_init);
static void __exit lm3533_i2c_exit(void)
{
i2c_del_driver(&lm3533_i2c_driver);
}
module_exit(lm3533_i2c_exit);
MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
MODULE_DESCRIPTION("LM3533 Core");
MODULE_LICENSE("GPL");